carleton



(No Model.)

J. W. OARLETON.

REVERSIBLE JAW FOB LATHE OHUCKS. 7 No. 302,649. Patented July 29, 1884.

NITED STATES PATENT OFFICE.

JOHN W. CARLETON, OF NEWV BRITAIN, CONNECTICUT, ASSIGNOB TO THE UNIONMANUFACTURING COMPANY, OF SAME PLACE.

REVERSIBLE JAW FOR LATHE CHUCKS.

SPECIFICATION forming part of Letters Patent No.'302,649, dated July29,1884.

Application filed January 14, 1884. (No model.)

To all whom, it may concern.-

Be it known that 1, JOHN W. CARLETON, a citizen of the United States,residing at New Britain, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inReversible Jaws for Lathe-Chucks, of which the following is aspecification.

My invention relates to improvements in reversible jaws forlathe-chucks; and the objects of my improvement are simplicity andeconomy in construction, convenience of reversibility, and efficiencyand firmness. I attain these objects by the construction illus trated inthe accompanying I drawings, in which a Figure 1 is a plan view of oneof my chuckjaws. Fig. 2 is a section thereof on line x 00 of Fig. 1, theholding-screws being represented in elevation; and Fig. 3 is a sideelevation of said chuck-jaw, the same being illus trated with itsreversible portion in a position the reverse of that shown in the otherfigures.

A designates the jaw proper, which is fitted within the chuck in anyordinary manner. In the outer face of this jaw proper I form threethreaded holes, a, the same being arranged at equal distances apart andwith the middle hole-in the middle of the length of the jaw. Surroundingthe outer end of this middle hole there is a round mortise, b, Fig. 2,which is also indicated by the broken circle in Fig. 1.

B designates the reversible jaw or the reversible portion of the wholejaw, the same being provided with a holding-face at each end, and withan intermediate holding-face, c. The inner face of this reversible jaw Bis provided with a circular tenon, d, which snugly fills the circularrecess b in the jaw proper. I

A holding-screw, f, passes through the reversible jaw into the middlethreaded hole of I the jaw proper, while another holding-screw,

passes through the jaw B into one of the end holes in the jaw proper.The reversible jaw thus seated on the jaw proper forms'a jaw with aseries of steps, which in external ap pearance is substantially anordinary form of chuclvjaw.

WVhen it is desired to reverse the jaw B from the position representedin Figs. 1 and 2 into that represented in Fig. 3 it is only necessary toloosen the screw f, remove the screw 9, swing the jaw around about theaxis of the 5 screw f into the position shown in Fig. 3, secure thescrew 9 in the threaded hole at the opposite end of thejaw proper, asindicated by broken linesin Fig. 3, and then tighten the screw f. Iprefer to remove the thread 6 for a short distance from the mouth of thethreaded holes at the ends of the jaw proper, so that the body orunthreaded portion of the screw 9 may have a bearingcontact in the mouthof said holes, and better hold the jaw 65 against lateral displacement.as illustrated in Fig. 2. The rounded tenon and 'mortise at the middleof the jaw A prevent the reversible jaw from slipping longitudinally onthe jaw proper, and prevent a longitudinal strain on the jaw B frombeing thrown upon the hold ing-bolts. By this means of preventinglongitudinal displacement, the reversible jaw is very convenientlyreversed, as it is necessary to remove only one of the holding-screwsfor 7 so doing.

I am aware that lathe chucks have heretofore been constructed with aportion of the jaw made reversible upon the jaw proper, and therefore Ido not claim the same, broadly.

I am also aware of the patent to J. C. Stevens,lathe-chuck j aw, N o.257 ,250,Ma y 2,1882, in which the jaw consists, essentially, of twoparts, the upper part being provided with the transverse tenon b, andthe lower part with 8 the transverse grooves a and a, which constrnctionis wholly different from thatconstruction shown in my invention; and Ihereby disclaim the same.

I claim as my invention- The herein-described chuck-jaw, consisting ofthe jaw proper having the threaded holes and circular mortisesurrounding the middle hole, andthe reversible jaw having the circulartenon and holding-screws, substantially as 9 described, and for thepurpose specified.

JOHN WV. CARLETON.

WVi tnesses:

N. G. OURTIs, A. D. WASHBURN.

